The formation ages of the Langzishan and Lieryu Formations in Lianshanguan area, Benxi, Liaoning Province, and its geological significance.
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摘要:
辽宁省本溪连山关地区出露大面积的古元古代辽河群地层，在朱家沟典型剖面浪子山组中识别出2层斜长角闪岩，镜下观察其原岩为玄武岩；在连山关及河栏镇里尔峪组中识别出一套酸性火山岩。对浪子山组2件斜长角闪岩样品、里尔峪组2件流纹岩样品测定LA-ICP-MS锆石U-Pb年龄。阴极发光图像显示，样品D020锆石内部结构整体发黑、条痕状吸收程度不等，Th/U值较低，为变质锆石，其1934±45Ma代表了浪子山组的变质年龄。其余3个样品阴极发光图像显示典型的岩浆振荡环带结构和较高的Th/U值，为岩浆锆石。1952±38Ma代表了浪子山组的形成时代，2177±34Ma和2208±12Ma代表了里尔峪组的形成时代。结合前人资料，将辽河群形成时代限制在2.20~1.95Ga，其形成时代持续了250Ma左右。野外接触关系及火山岩年代学特征从另一个方面揭露了辽河群总体为一套无序、局部有序的构造地层，各岩组间不存在上下关系，浪子山组已经不适合置于里尔峪组之下。
Abstract:A large area of the Paleoproterozoic Liaohe Group is exposed in Lianshanguan area, Benxi, Liaoning Province. Two layers of amphibolite and a set of felsic volcanic rocks have been identified in the Langzishanand Lieryu Formations of the Liaohe Group. The samples include two amphibolites and two rhyolites. Zircons from D020 for LA-ICP-MS U-Pb dating have black interior structure, unequal striation absorption and low Th/U ratios, indicating typical metamorphic origin. The age of 1934±45Ma represents the metamorphic age of the Langzishan Formation. Zircons from the other three samples for LA-ICP-MS U-Pb dating have oscillatory zoning and high Th/U ratios, indicating typical magmatic origin. The ages of 1952±38Ma and 2177±34Ma, 2208±12Ma represent the formation age of the Langzishan and Lieryu Formations respectively. In consideration of previous data, the authors hold that the formation age of the Liaohe Group is limited in the range of 2.20~1.95Ga, lasting about 250Ma. Field contact relations and chronological characteristics of volcanic rocks reveal that the Liaohe Group is a series of disordered and locally ordered structural strata, and there is no upper and lower relation between the rock groups. The Langzishan Formation is no longer suitable for being placed beneath the Lieryu Formation.
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表 1 研究区辽河群浪子山组斜长角闪岩和里尔峪组流纹岩LA-ICP-MS锆石U-Th-Pb分析结果
Table 1. LA-ICP-MS zircon U-Th-Pb isotope composition of amphibolite from Langzishan Formation and rhyolite from Lieryu Formatiom in the Liaohe Group
测点编号 Pb Th U Th/U 同位素比值 年龄/Ma 10-6 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ D020斜长角闪岩 1 15 2 53 0.05 0.1152 0.0028 4.9730 0.0680 0.3132 0.0063 1882 45 1815 12 1756 31 2 18 6 59 0.10 0.1201 0.0029 5.1730 0.0690 0.3124 0.0061 1958 43 1848 11 1752 30 3 19 4 63 0.06 0.1157 0.0026 5.0197 0.0590 0.3148 0.0061 1890 41 1823 10 1764 30 4 14 4 45 0.08 0.1244 0.0032 5.3590 0.0832 0.3125 0.0064 2020 47 1878 13 1753 32 5 19 4 62 0.07 0.1230 0.0030 5.3132 0.0715 0.3133 0.0062 2000 44 1871 11 1757 30 6 21 7 72 0.10 0.1188 0.0028 4.8244 0.0628 0.2946 0.0058 1938 43 1789 11 1664 29 7 85 117 204 0.57 0.1569 0.0015 8.5205 0.0832 0.3938 0.0076 2423 20 2288 9 2141 35 8 32 39 66 0.59 0.1633 0.0040 9.9357 0.1425 0.4412 0.0088 2490 42 2429 13 2356 39 9 54 17 212 0.08 0.1130 0.0011 4.3697 0.0430 0.2805 0.0054 1848 21 1707 8 1594 27 10 14 21 40 0.52 0.1325 0.0032 6.0473 0.0839 0.3309 0.0065 2132 43 1983 12 1843 32 11 25 31 48 0.64 0.1649 0.0018 10.6261 0.1155 0.4672 0.0092 2507 19 2491 10 2471 41 12 25 6 76 0.09 0.1233 0.0028 5.8314 0.0686 0.3430 0.0066 2004 41 1951 10 1901 32 13 22 4 73 0.06 0.1190 0.0031 5.1261 0.0786 0.3123 0.0064 1942 47 1840 13 1752 32 14 20 4 66 0.06 0.1248 0.0031 5.3790 0.0765 0.3126 0.0063 2026 45 1882 12 1754 31 15 19 6 60 0.10 0.1231 0.0029 5.3256 0.0682 0.3138 0.0061 2002 42 1873 11 1759 30 16 17 4 59 0.06 0.1230 0.0031 4.9502 0.0750 0.2920 0.0060 2000 46 1811 13 1651 30 D021斜长角闪岩 01* 325 18711 3311 5.65 0.0972 0.0010 1.0745 0.0109 0.0802 0.0015 1571 21 741 5 497 9 2 187 347 440 0.79 0.1154 0.0012 5.3581 0.0556 0.3368 0.0065 1886 20 1878 9 1871 31 3 307 2023 886 2.28 0.1101 0.0011 3.6561 0.0362 0.2409 0.0046 1800 21 1562 8 1392 24 4 305 1116 822 1.36 0.1149 0.0012 4.1754 0.0412 0.2636 0.0050 1878 20 1669 8 1508 26 5 340 1284 996 1.29 0.1127 0.0011 3.8977 0.0383 0.2508 0.0048 1843 21 1613 8 1443 25 6 352 4133 1592 2.60 0.1026 0.0010 2.2173 0.0216 0.1567 0.0030 1672 21 1187 7 938 17 7 490 5514 2148 2.57 0.0960 0.0009 2.2072 0.0210 0.1668 0.0032 1547 21 1183 7 995 17 8 249 944 672 1.41 0.1153 0.0012 4.2157 0.0421 0.2651 0.0051 1885 20 1677 8 1516 26 9 392 1529 930 1.64 0.1153 0.0011 4.8836 0.0465 0.3073 0.0058 1884 21 1799 8 1728 29 10 309 1291 1036 1.25 0.1069 0.0011 3.3303 0.0323 0.2260 0.0043 1746 21 1488 8 1314 23 11 331 3939 1501 2.62 0.1005 0.0010 2.5008 0.0240 0.1805 0.0034 1633 21 1272 7 1070 19 12 285 3948 897 4.40 0.1071 0.0011 3.2848 0.0318 0.2224 0.0042 1751 21 1477 8 1295 22 13* 775 6803 2946 2.31 0.1169 0.0011 2.6369 0.0245 0.1636 0.0031 1909 21 1311 7 977 17 14 278 640 966 0.66 0.1072 0.0011 3.5166 0.0354 0.2379 0.0045 1752 20 1531 8 1376 24 15 422 3471 1394 2.49 0.1063 0.0010 3.1435 0.0301 0.2145 0.0041 1737 21 1443 7 1253 21 16 288 1071 831 1.29 0.1146 0.0011 4.2476 0.0409 0.2689 0.0051 1873 20 1683 8 1535 26 17 329 3517 1895 1.86 0.0964 0.0010 1.7250 0.0166 0.1298 0.0025 1555 21 1018 6 787 14 18* 339 10485 2439 4.30 0.1029 0.0010 1.5276 0.0146 0.1077 0.0020 1676 21 942 6 659 12 19 318 2130 1090 1.95 0.1074 0.0011 3.4091 0.0327 0.2301 0.0043 1756 21 1506 8 1335 23 20 321 1888 1186 1.59 0.1077 0.0011 2.9888 0.0287 0.2014 0.0038 1760 21 1405 7 1183 20 21 335 2026 1049 1.93 0.1132 0.0011 3.7410 0.0361 0.2396 0.0045 1852 20 1580 8 1385 24 22 376 2731 1429 1.91 0.1043 0.0010 2.7469 0.0262 0.1911 0.0036 1701 21 1341 7 1127 19 23 323 1218 856 1.42 0.1194 0.0012 4.6983 0.0451 0.2855 0.0054 1947 20 1767 8 1619 27 24 327 1684 1203 1.40 0.1090 0.0011 3.0429 0.0294 0.2025 0.0038 1782 21 1418 7 1189 20 25 224 516 700 0.74 0.1104 0.0011 3.9806 0.0390 0.2615 0.0049 1806 20 1630 8 1498 25 26 246 448 543 0.83 0.1233 0.0014 5.7030 0.0621 0.3356 0.0065 2004 19 1932 9 1866 31 27* 619 23340 4116 5.67 0.1467 0.0014 1.6068 0.0151 0.0794 0.0015 2308 19 973 6 493 9 28 522 2546 1303 1.95 0.1147 0.0011 4.1488 0.0395 0.2625 0.0049 1875 20 1664 8 1502 25 TWD15013灰粉色流纹岩 1 74 161 263 0.61 0.1309 0.0016 3.8685 0.0539 0.2143 0.0028 2110 11 1607 11 1252 15 2 138 192 256 0.75 0.1426 0.0017 7.6280 0.1054 0.3880 0.0050 2259 11 2188 12 2114 23 3 165 220 310 0.71 0.1331 0.0021 7.3585 0.1265 0.4008 0.0057 2140 14 2156 15 2173 26 4 71 83 146 0.57 0.1380 0.0020 6.9774 0.1107 0.3668 0.0050 2202 12 2109 14 2014 24 5 181 161 348 0.46 0.1375 0.0025 7.6053 0.1440 0.4012 0.0060 2196 15 2185 17 2174 28 6 93 190 240 0.79 0.1378 0.0020 5.3337 0.0854 0.2808 0.0039 2199 12 1874 14 1595 19 7 67 70 133 0.52 0.1387 0.0036 7.2736 0.1568 0.3805 0.0055 2211 46 2146 19 2078 26 8 238 277 470 0.59 0.1468 0.0027 7.7588 0.1490 0.3833 0.0059 2309 15 2203 17 2092 27 9 186 274 387 0.71 0.1359 0.0034 6.7953 0.1702 0.3626 0.0065 2175 21 2085 22 1994 31 10 207 234 392 0.60 0.1338 0.0023 7.4216 0.1362 0.4022 0.0060 2149 15 2164 16 2179 27 11 97 86 197 0.44 0.1355 0.0018 7.1841 0.1064 0.3844 0.0051 2171 12 2135 13 2097 24 12 96 127 208 0.61 0.1438 0.0018 6.8239 0.0978 0.3441 0.0046 2274 11 2089 13 1906 22 13 176 266 338 0.79 0.1236 0.0027 6.4754 0.1426 0.3800 0.0062 2008 19 2043 19 2076 29 14 130 208 241 0.86 0.1353 0.0027 7.3738 0.1484 0.3952 0.0062 2168 16 2158 18 2147 29 15 155 181 305 0.59 0.1372 0.0021 7.2192 0.1196 0.3816 0.0054 2192 13 2139 15 2084 25 16 220 275 442 0.62 0.1285 0.0019 6.7267 0.1086 0.3798 0.0053 2077 13 2076 14 2075 25 17 354 492 678 0.73 0.1341 0.0014 7.0192 0.0901 0.3795 0.0048 2153 10 2114 11 2074 23 18 127 141 194 0.73 0.1612 0.0018 10.6022 0.1398 0.4769 0.0062 2469 10 2489 12 2514 27 19 104 104 218 0.48 0.1325 0.0015 6.7773 0.0906 0.3708 0.0048 2132 11 2083 12 2033 23 20 128 222 274 0.81 0.1311 0.0020 6.2361 0.1021 0.3450 0.0049 2113 13 2010 14 1911 23 21 48 83 83 1.00 0.1358 0.0017 7.4144 0.1065 0.3959 0.0053 2174 11 2163 13 2150 24 22 191 252 361 0.70 0.1330 0.0014 7.1599 0.0919 0.3903 0.0050 2138 10 2132 11 2124 23 23 50 93 101 0.92 0.1336 0.0020 6.3989 0.1050 0.3474 0.0049 2146 13 2032 14 1922 24 24 123 148 220 0.67 0.1324 0.0015 7.6283 0.1015 0.4178 0.0054 2130 11 2188 12 2251 25 25 129 174 256 0.68 0.1380 0.0016 7.1214 0.0947 0.3744 0.0049 2202 10 2127 12 2050 23 TWD15056灰粉色流纹岩 1 378 659 722 0.91 0.1401 0.0015 7.0743 0.0921 0.3663 0.0046 2228 10 2121 12 2012 22 2 50 65 101 0.65 0.1369 0.0018 7.0600 0.1045 0.3739 0.0050 2189 11 2119 13 2048 23 3 83 140 188 0.74 0.1413 0.0021 6.4705 0.1030 0.3320 0.0045 2244 12 2042 14 1848 22 4 242 359 490 0.73 0.1360 0.0014 6.8743 0.0885 0.3666 0.0046 2177 10 2095 11 2013 22 5 151 229 294 0.78 0.1399 0.0016 7.1909 0.0983 0.3727 0.0048 2226 11 2135 12 2042 22 6 75 71 153 0.46 0.1355 0.0019 7.0519 0.1076 0.3774 0.0051 2171 12 2118 14 2064 24 7 131 195 248 0.79 0.1389 0.0017 7.2668 0.1030 0.3795 0.0049 2213 11 2145 13 2074 23 8 128 165 253 0.65 0.1373 0.0015 7.1542 0.0945 0.3779 0.0048 2194 10 2131 12 2066 22 9 82 104 166 0.63 0.1385 0.0016 7.1124 0.0962 0.3725 0.0048 2208 11 2126 12 2041 22 10 338 426 690 0.62 0.1373 0.0015 7.1622 0.0922 0.3784 0.0047 2193 10 2132 11 2069 22 11 84 86 166 0.52 0.1385 0.0019 7.3170 0.1101 0.3831 0.0051 2209 12 2151 13 2091 24 12 187 274 351 0.78 0.1405 0.0016 7.4330 0.0987 0.3838 0.0049 2233 10 2165 12 2094 23 13 79 126 161 0.78 0.1374 0.0018 7.0008 0.1028 0.3696 0.0049 2194 11 2112 13 2028 23 14 84 397 490 0.81 0.1365 0.0017 2.4964 0.0356 0.1327 0.0017 2183 11 1271 10 803 10 15* 209 106 216 0.49 0.3018 0.0032 27.9573 0.3570 0.6719 0.0085 3479 9 3418 13 3313 33 16 79 95 153 0.62 0.1416 0.0017 7.4723 0.1022 0.3828 0.0049 2246 11 2170 12 2089 23 17* 18 141 259 0.55 0.0657 0.0025 0.4836 0.0168 0.0534 0.0008 798 80 401 11 335 5 18 245 363 456 0.80 0.1377 0.0015 7.2989 0.0957 0.3843 0.0048 2199 10 2149 12 2096 23 19 103 114 202 0.57 0.1402 0.0016 7.4262 0.1010 0.3841 0.0049 2230 11 2164 12 2095 23 20 99 141 191 0.74 0.1392 0.0017 7.2228 0.1005 0.3762 0.0049 2218 11 2139 12 2059 23 21 76 142 170 0.84 0.1406 0.0017 6.4167 0.0885 0.3310 0.0043 2234 11 2035 12 1843 21 22 122 150 241 0.62 0.1373 0.0016 7.1836 0.0985 0.3795 0.0049 2193 11 2134 12 2074 23 23 92 111 179 0.62 0.1418 0.0017 7.4581 0.1048 0.3813 0.0050 2250 11 2168 13 2082 23 24 88 73 183 0.40 0.1362 0.0016 7.1532 0.0971 0.3810 0.0049 2179 11 2131 12 2081 23 25 301 837 695 1.21 0.1323 0.0014 5.9479 0.0757 0.3260 0.0041 2129 10 1968 11 1819 20 注：*代表偏离不一致线未采用点 
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